From: Richard M. Stallman <rms@gnu.org>
Date: Fri, 17 Sep 1999 20:57:37 +0000 (+0000)
Subject: (after-find-file): When visiting a backup file, make it read-only.
X-Git-Tag: emacs-pretest-21.0.90~6689
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=8120f989022ed9ba82eefa6723e484db9a1e1ccb;p=emacs.git

(after-find-file): When visiting a backup file, make it read-only.
---

diff --git a/lisp/files.el b/lisp/files.el
index ee56e4d3bf2..144d79da28e 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -1189,7 +1189,7 @@ unless NOMODES is non-nil."
 	   (msg
 	    (cond ((and error (file-attributes buffer-file-name))
 		   (setq buffer-read-only t)
-		   "File exists, but cannot be read.")
+		   "File exists, but cannot be read")
 		  ((not buffer-read-only)
 		   (if (and warn
 			    (file-newer-than-file-p (make-auto-save-file-name)
@@ -1216,6 +1216,10 @@ unless NOMODES is non-nil."
 	    (or not-serious (sit-for 1 nil t)))))
     (if (and auto-save-default (not noauto))
 	(auto-save-mode t)))
+  ;; Make people do a little extra work (C-x C-q)
+  ;; before altering a backup file.
+  (if (backup-file-name-p buffer-file-name)
+      (setq buffer-read-only t))
   (if nomodes
       nil
     (and view-read-only view-mode